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[Technical Comment] Comment on “Long-term climate forcing by atmospheric oxygen concentrations”

ScienceNOW - Fetched: July 7th, 2016, 3:00pm UTC

Poulsen et al. (Reports, 12 June 2015, p. 1238) argued that lower atmospheric oxygen levels during the Phanerozoic would have given a warmer climate. However, radiative and atmospheric structure changes under lower pressure both cause cooling, making their result unusual in that a hierarchy of models gives opposing results. Scrutiny of how radiative and cloud processes were represented, and a mechanistic explanation of the results, are required. Author: Colin Goldblatt

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